The event commemorated by the Fourth of July in the United States is the adoption of the Declaration of Independence on July 4, 1776. This day marks the official declaration of the thirteen American colonies' independence from British rule. The Fourth of July is celebrated annually with various festivities, including fireworks, parades, and barbecues, reflecting the theme of freedom and patriotism. Over time, it has become a national holiday representing American values of liberty and democracy. The date is significant as it symbolizes not only the birth of the nation but also the principles on which the United States was founded.